One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,13)(4,9)(5,11)(6,10)(7,12)(8,14)(15,16)(17,18)(19,23)(20,30)(21,33)(22,25)(24,32)(26,36)(27,43)(28,41)(29,38)(31,42)(34,39)(35,40)(37,45)(44,47)(46,48) involution — undirected(1,3,7,4)(2,8,12,16)(5,14,6,15)(9,10,13,11)(17,19,22,29)(18,23,25,38)(20,27,31,44)(21,34,36,28)(24,37,40,48)(26,41,33,39)(30,47,42,43)(32,46,35,45)(1,4,7,3)(2,9,12,13)(5,14,6,15)(8,10,16,11)(17,20)(18,24)(19,27)(21,35)(22,31)(23,37)(25,40)(26,42)(28,46)(29,44)(30,33)(32,36)(34,45)(38,48)(39,47)(41,43)(18,25)(23,38)(24,40)(26,33)(30,42)(37,48)(39,41)(43,47) involution — undirected(1,5,7,6)(2,10,12,11)(3,14,4,15)(8,13,16,9)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.